For conspiring to illegally export missile-grade metallic powder to Iran, the head of a New York-based metallurgy company was sentenced to four years and nine months in prison on Thursday.Court records show, 45 year old Erdal Kuyumcu was sentenced by U.S. District Judge Dora Irizarry in Brooklyn. He pleaded guilty in June 2016 to conspiring to violate the International Emergency Economic Powers Act.Kuyumcu’s attorney, Patrick Mullin, said, “We are obviously very disappointed in the court’s sentence today, and will be exploring the available options."